CIE Model
CIE: International Commission on Illumination
(1931)
Describes any visible color with only positive
primaries
Primaries are called: X, Y, Z
Color is described by
chrominance x,
y, and
luminance Y
Apart
from the very approximate relationship between Y and brightness, there is almost nothing intuitive about
the XYZ color-matching
functions. While they have served us quite
well as a technical standard, they have served us quite poorly in explaining the discipline to new
students and colleagues or
as an intuition about color appearance.
-
Wandell